Children vomit when they have a fever, in fact, the elevated body temperature itself will cause abnormalities in the neurohumoral regulation system, and at this time the child’s gastrointestinal peristalsis function and digestive system may not be too good. In addition, the intestinal flora will be disorganized after the body temperature rises, and the activity of some digestive enzymes will be reduced. All these reasons will lead to a result, that is, the child’s digestive function is not good, poor appetite, nausea, vomiting. In addition, some special diseases caused by vomiting and fever, but may be more closely related to other causes of vomiting, such as meningitis caused by cerebral edema, this time the vomiting, may be a manifestation of increased intracranial pressure.